A list of module effects, or just a single effect. Modules with other effects cannot be used on the machine. This means that both effects from modules and from surrounding beacons are restricted to the listed effects. If allowed_effects is an empty array, the machine cannot be affected by modules or beacons.
"speed" | "productivity" | "consumption" | "pollution" | "quality" | Array<"speed" | "productivity" | "consumption" | "pollution" | "quality">